Graphical user interface for a display screen or portion thereof



The single FIGURE is a front view of a graphical user interface for a display screen or portion thereof showing our new design.

The broken line showing of the display screen or portion thereof in the FIGURE is not part of the claimed design.

The Flickr trademarks in the upper left of the FIGURE are the property of Yahoo! Inc. Trademarks are the property of their respective owners. 

The ornamental design for a graphical user interface for a display screen or a portion thereof, as shown and described. 